Leases Lease, Description (Details) $ in Millions	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lessee, Leases Not yet Commenced, Estimate	$ 100
Operating Lease, Weighted Average Remaining Lease Term	8 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	4 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	3.30%
Finance Lease, Weighted Average Discount Rate, Percent	3.90%
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	10 years